Question

If s is the sum to infinity of a gp whose first term is A then the sum of first n term is

Answer 1

Dear student
Given that first term = A

S = sum to infinity of a G.P = A / ( 1 - r).

Sn = A( 1 - rn ) / ( 1 - r ) .

Sn = S( 1- rn ) = S ( 1 - { 1- A / S}n ).


Regards